Python Day 27: Testing
This problem is all about unit testing.
Your company needs a function that meets the following requirements:
For a given array of n integers, the function returns the index of the element with the minimum value in the array. If there is more than one element with the minimum value, the returned index should be the smallest one.
If an empty array is passed to the function, it should raise an Exception.
Note: The arrays are indexed from 0.
- def minimum_index(seq):
- if len(seq) == 0:
- raise ValueError("Cannot get the minimum value index from an empty sequence")
- min_idx = 0
- for i in range(1, len(seq)):
- if seq[i] < seq[min_idx]:
- min_idx = i
- return min_idx
-
- class TestDataEmptyArray():
-
- @staticmethod
- def get_array():
- return list()
-
- class TestDataUniqueValues():
-
- @staticmethod
- def get_array():
- return [5, 2, 8, 3, 1, -6, 9]
-
- @staticmethod
- def get_expected_result():
- return 5
-
- class TestDataExactlyTwoDifferentMinimums():
-
- @staticmethod
- def get_array():
- return [5, 2, 8, 3, 1, -6, 9, -6, 10]
-
- @staticmethod
- def get_expected_result():
- return 5
-
-
- def TestWithEmptyArray():
- try:
- seq = TestDataEmptyArray.get_array()
- result = minimum_index(seq)
- except ValueError as e:
- pass
- else:
- assert False
-
-
- def TestWithUniqueValues():
- seq = TestDataUniqueValues.get_array()
- assert len(seq) >= 2
-
- assert len(list(set(seq))) == len(seq)
-
- expected_result = TestDataUniqueValues.get_expected_result()
- result = minimum_index(seq)
- assert result == expected_result
-
-
- def TestiWithExactyTwoDifferentMinimums():
- seq = TestDataExactlyTwoDifferentMinimums.get_array()
- assert len(seq) >= 2
- tmp = sorted(seq)
- assert tmp[0] == tmp[1] and (len(tmp) == 2 or tmp[1] < tmp[2])
-
- expected_result = TestDataExactlyTwoDifferentMinimums.get_expected_result()
- result = minimum_index(seq)
- assert result == expected_result
-
- TestWithEmptyArray()
- TestWithUniqueValues()
- TestiWithExactyTwoDifferentMinimums()
- print("OK")
